Hi, I'm Sarthak — Backend Engineer at CarePay

I build APIs, AI workflows and reliable backend systems.

Java, Spring Boot, Node and a growing set of LLM tools. Currently shipping fintech infrastructure in Gurugram — 500+ production endpoints, RAG-powered loan journeys, and the occasional 40% faster query.

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Gurugram, Haryana · Open to backend and AI roles
Cartoon illustration of Sarthak coding on a laptop
CarePay · Backend Engineer
Experience

Where I've been building.

Backend work in fintech and ed-tech — production APIs, AI workflows and the unglamorous bugs that keep systems honest.

  1. Backend Engineer

    Now

    CareCoin Technologies (CarePay) · Fintech Startup

    September 2025 – Present

    Gurgaon, Haryana

    • Built backend systems for lead management platforms, enabling processing of 200 applications per day.
    • Developed and integrated 500+ production REST API endpoints supporting customer onboarding, loan processing, and document management workflows.
    • Reduced API response times by 40% by optimizing PostgreSQL queries and adding database indexes.
    • Developed an AI-based user workflow using RAG to simplify the end-to-end loan application journey.
    • Onboarded and integrated 2 NBFCs including Poonawalla Fincorp and Findoc into the loan-processing stack.
    • Automated 4+ recurring operational workflows, reducing manual effort for daily backend operations.
    • Java
    • Spring Boot
    • Python
    • LangChain
    • PostgreSQL
    • AWS S3
    • Docker

  2. Backend Engineer

    Vasudhaiva Kutumbakam Group (Leverage Edu) · Ed-tech Startup

    January 2025 – August 2025

    Noida, Uttar Pradesh

    • Developed and maintained REST APIs and backend services supporting 2 internal business operations teams.
    • Resolved 150+ production issues across APIs, database queries, and application workflows, improving system stability and reducing recurring defects.
    • Collaborated with product and QA teams to design, implement, and test REST API integrations for new features.
    • Node.js
    • Express.js
    • React.js
    • MongoDB
    • Git
    • Postman
Featured work

Things I've shipped that I'm proud of.

AI systems, a CRM, and a few frontend experiments that taught me how products actually feel.

January 2026 – April 2026

AI Contract Intelligence Platform

Analyze PDF and DOCX contracts — summaries, clause extraction, risk flags and semantic Q&A.

  • Built a contract intelligence platform that analyzes PDF/DOCX documents to summarize contracts, extract clauses, identify potential risks, compare documents, and support semantic Q&A.
  • Developed an AI-powered analysis backend using Spring Boot, PostgreSQL and Google Gemini for RAG chat, semantic search and automated legal document analysis.
  • Java
  • Spring Boot
  • PostgreSQL
  • Google Gemini
  • REST APIs
Code
August 2024 – December 2024

AI Interview Simulator

Mock interviews with dynamic questions, LLM evaluation, scoring and facial-expression analysis.

  • Developed a web-based interview simulator with AI-driven evaluation for real-time, accurate responses.
  • Integrated an LLM feedback system to deliver results with 96.4%+ response accuracy, plus facial-expression confidence scores for performance tracking.
  • MongoDB
  • Express.js
  • React.js
  • Node.js
  • LLM APIs
CodeLive
2025

Dealstack CRM

Full-stack CRM for leads, deals and customer workflows with a live sales pipeline.

  • Built REST APIs in Node.js and Express with secure authentication and structured schemas for leads, deals and customers.
  • Designed a React frontend for tracking sales pipelines and customer interactions in one place.
  • Node.js
  • Express
  • React
  • REST APIs
CodeLive
June 2024

DELICIRO — Food Ordering Website

Responsive food-ordering site with dynamic menus, reusable components and clean UI.

  • Built a fully functional food ordering website in React with dynamic menu listings and client-side state management.
  • Focused on systematic coding, advanced CSS and fast, cross-device layouts.
  • React.js
  • HTML
  • CSS
Code
June 2024

Interactive Web Guitar

SVG guitar strings that bend with the mouse and play a note when you pluck them.

  • Used GSAP to animate SVG paths so each string curves like a real pluck.
  • Mapped mouse interaction to audio playback while respecting browser autoplay rules.
  • HTML
  • CSS
  • GSAP
  • SVG
Code
View all 19 projects
Skills

The stack I work in every week.

Java and Spring Boot in production, plus Node, React, Postgres and a growing set of LLM tools.

Languages

  • Java
  • Python
  • JavaScript
  • SQL

Backend

  • Spring Boot
  • Spring MVC
  • Node.js
  • Hibernate
  • REST APIs
  • Microservices
  • JWT
  • OAuth 2.0
  • Maven

Frontend

  • ReactJS
  • JavaScript
  • HTML
  • CSS

Databases

  • PostgreSQL
  • MySQL
  • MongoDB
  • Redis
  • Database Design
  • Query Optimization
  • Indexing

AI & LLM

  • LLM APIs
  • Google Gemini
  • LangChain4j
  • RAG
  • Vector Search
  • AI Workflow Automation

Cloud & DevOps

  • AWS (EC2, S3, RDS)
  • Docker
  • CI/CD
  • Linux
  • Supabase

Tools

  • Git
  • GitHub
  • Bitbucket
  • Postman
  • IntelliJ IDEA
  • Jira
  • Cursor
  • n8n
  • Zapier
Education

School, then more school.

MCA from Thapar. BCA from Maharishi Markandeshwar. Both finished with a number I still like.

Master of Computer Applications

Thapar Institute of Engineering and Technology

Patiala, Punjab · July 2023 – May 2025

CGPA 8.6 / 10.0

Bachelor of Computer Applications

Maharishi Markandeshwar

Mullana, Haryana · August 2020 – May 2023

CGPA 9.45 / 10.0

Want to work together?

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